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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63bc1799c7df66db943067c16611e1c6faf84501832dd9da634c0e2c6e05700' 
  AND token = '2Foc8iOZhOLEH2tn4cskzhpcm8NiMeLT11FFWikYaIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}